Metal stairway construction



E. BERSON METAL- STAIRWAY/CONSTRUCTION July 20 1926.

' Filed-Jan.

5 I 5 I I I I I I I 9 I I I I g I I I I I 5 r111 ATTORNEYS Patented July20, 1926.

UNITED STATES 1,593,413 PATENT FFECE.

ELIAS BERSON, or nEw'YonK, n; Y.

7 METAL STAIRWAY CONSTRUCTION.

Application filed January 13, 1926.

pieces. 'It is obvious that under this prac-' tice considerable time andlabor are in volved and hence it is an object of the present inventionto overcome the above-recited objectionable features and disadvantagesby constructing the elements of a metal stairway in such a manner as toeliminate the necessity of riveting, bolting, or employing other similarmeans of connecting the elements when erecting or assembling the same.

The invention furthermore comprehends a metal. stairway which iscomparatively simple in its construction and mode of assembly, which isinexpensive both in the production of the elements which make up thestairway and in the operation of assembly, and which is highlyefficient, strong and durable.

lVith the above recited and other objects in view, reference ishad tothe following specification and accompanying drawings in which there isexhibited one example or embodiment of the invention which is in no wayintended as a limitation upon the scope of the appended claims as it isto be clearly understood that variations and modifications whichproperly fall within the scope-of said claims may be resorted to whenfound expedient.

In the drawings 7 Figure 1 is a fragmentary vertical sectional viewthrough a stairway constructed in accordance with the invention;

Fig. 2 is a fragmentary detail transverse sectional view takenapproximately on the line 22 of Fig. 1, and

Fig. 3 is a collective perspective view of certain elements of thestairway.

Referring to the drawings by characters of reference, 10 designates astringpiece, a pair of which are obviously used in connection with eachstairway, and 11 indicates generally the steps, each of which includes ahorizontal tread member 12 and a vertical riser member 13, which arepreferably formed integral, the tread member being formed at its forwardend with an upward- Serial No. 81,064.

1y bent terminal 1 1 and an inwardly bent extremity 15 defining a nose;In order to support each step from and between a pair of stringpieces10, an angle bracket 16 is secured to the inner sides of the stringpiece10, preferably by riveting the vertical or base flange 17 to thestringpiece so that the horizontal flange 18 thereof constitutes a shelfupon which the end of the tread member of each step rests.

As heretofore set forth, it is the common ractice in erectin orassemblin the stairway, when building the same to rivet the treads 12 tothe horizontal shelves 18, and under this practice the risers 11 areprovided with an angularly horizontally disposed upper end which isriveted to the tread. However, in contradistinction to this the presentinvention contemplates the elimination of the riveting or bolting ofthese elemerits by forming the tread adjacent the nose, with atransversely disposed upwardly offset portion 19 defining on the underside a groove 20 within which the upper edge of the riser of the nextadjacent lower step is received. In lieu of rivets, the tread members ofthe steps are connected to the shelves 18 by means of upstruck tongues21 in the shelves 18, which tongues are received in openings or slots 22formed in the opposite ends of the treads. The angle brackets 16,however, are riveted as at 23, at the factory or place of production ofthe parts, so that the stair builder when the material is received atthe place where it is to be erected, has only to properly position thestringpieces 10, set the steps on the brackets, position the grooves 20over the upper edges of the risers, insert the tongues 21 through theopenings or slots 22, and bend the tongues 21 over, as illustratedclearly in Fig. 2. A filler F, such as cement or other material, is thenplaced on the treads 12 between the stringpieces, the noses and therisers.

It is therefore obvious from the foregoing that a substantial saving oreconomy both in time and labor, is effected as the elimination ofriveting or bolting when erecting and assembling a stairway is ob tainedand this without sacrificing strength or durability of the structurewhen completed.

What is claimed is:

1. In a metal stairway construction, steps having transverse grooves inthe under side of the treads adapted to receive the upper edges of therisers, and stringpieces having step brackets provided with bendableupstanding tongues, the tread members havin openings through which thetongues are received, with the terminals laterally bent.

2. A metal stairway, including string pieces, angle brackets secured tothe inner facesthereof having horizontal flanges provide'd \vithupstanding bendable tongues,

step members including vertical riser portions and horizontal treadportions, the latter having apertures in the opposite ends for thereception of the bendable tongues, 1 the terminals of which arelaterally bent to overlie the same, and upwardly oll'set transversegrooves adjacent the nose of each step adapted to singly receive theupper edge of the riser of the next adjacent lower 20 step.

ELIAS PERSON.-

